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DRAW. NO.
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TITLE
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93
DESCRIPTIONDESIG.DATE
Power Failure Backup Module
Descriptions
A-53866E-464
8.2 SELECTING SUB MODULE C
If you use the Retract function at power failure, you need sub module C as the source
of energy for driving motors after a power failure occurs. The amount of energy required
for retraction differs depending on the machine configuration; connect as many sub modules
C as necessary for the machine configuration used.
This section describes how to calculate the number of sub modules C to be connected in
a gear cutting machine.
To determine the number of sub modules C to be connected, you need the following data items:
Determine the number of sub modules C to be connected, using expression <1>.
Number of sub modules C
≥
Expression <1>
Amount of energy required for retraction at power failure
Amount of energy that can be supplied per sub module C x 0.7
The amount of energy that can be supplied per sub module C can be determined using expression <2>
in Subsection 8.2.1.
The amount of energy required for retraction in the event of a power failure can be determined by
adding the results of expressions <3> and <4> in Subsection 8.2.2.
V1 [V]: PSM input voltage before a power failure occurs (three-phase AC input voltage in normal operation)
P2 [kW]: Maximum cutting output before a power failure occurs
Jm [kgm
2
]: Rotor inertia of the motor
JL [kgm
2
]: Inertia of the load corrected to by calculation to the motor axis
Vm [min
-1
]: Motor speed during retraction
TL [Nm]: For the horizontal axis, friction torque of the machine (motor converted)
For the vertical axis, torque required during rapid traverse rise (motor converted)
d [mm]: Travel distance to a position where the workpiece and the tool do not interfere with each othe
(required retraction amount)
L[mm/rev]: Travel distance per motor rotation